Adnan Ashraf

Publications (9) View all

• Source

  Available from: M. Nawaz Tahir

  Article: 2-(1H-Benzimidazol-2-yl)-N-[(E)-(dimethyl-amino)-methyl-idene]benzene-sulfonamide.

  Adnan Ashraf, M Nawaz Tahir, Waseeq Ahmad Siddiqui, Nadia Perveen
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  ABSTRACT: The asymmetric unit of the title compound, C(16)H(16)N(4)O(2)S, contains two mol-ecules (A and B) with similar conformations: the benzene rings are oriented at dihedral angles of 80.94 (10)° and 84.54 (10)° with their adjacent 1H-benzimidazole groups. In the crystal, the mol-ecules are connected by N-H⋯N hydrogen bonds, forming separate C(4) chains of both the A and B mol-ecules along [010]. The A and B chains are cross-linked by several C-H⋯O inter-actions involving the benzene rings and the sulfonyl groups, which lead to R(2) (1)(5) loops in the linkage of the chains.
  Acta Crystallographica Section E Structure Reports Online 07/2012; 68(Pt 7):o2069. · 0.35 Impact Factor
• Source

  Available from: PubMed Central

  Article: 2,6-Dibromo-4-chloro-aniline.

  Umar Sharif Ali, Waseeq Ahmad Siddiqui, Adnan Ashraf, M Nawaz Tahir
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  ABSTRACT: The title compound, C(6)H(4)Br(2)ClN, is almost planar (r.m.s. deviation = 0.024 Å) and two intra-molecular N-H⋯Br hydrogen bonds generate S(5) rings. In the crystal, N-H⋯Br hydrogen bonds link the mol-ecules into chains propagating in [010].
  Acta Crystallographica Section E Structure Reports Online 06/2012; 68(Pt 6):o1904. · 0.35 Impact Factor
• Source

  Available from: PubMed Central

  Article: N-Benzyl-4-hy-droxy-2-methyl-1,1-dioxo-2H-1λ(6),2-benzothia-zine-3-carboxamide.

  Farhana Aman, Waseeq Ahmad Siddiqui, Adnan Ashraf, Hamid Latif Siddiqui, Masood Parvez
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  ABSTRACT: In the title mol-ecule, C(17)H(16)N(2)O(4)S, the heterocyclic thia-zine ring adopts a half-chair conformation, with the S and N atoms displaced by 0.546 (4) and 0.281 (4) Å, respectively, on opposite sides of the mean plane formed by the remaining ring atoms. The mol-ecular structure is stabilized by an intra-molecular O-H⋯O hydrogen bond. The two aromatic rings are inclined to one another by 42.32 (11)°. In the crystal, mol-ecules are linked by pairs of N-H⋯O hydrogen bonds, forming inversion dimers. The dimers are linked via a series of C-H⋯O inter-actions, leading to the formation of a three-dimensional network.
  Acta Crystallographica Section E Structure Reports Online 06/2012; 68(Pt 6):o1921. · 0.35 Impact Factor
• Source

  Available from: PubMed Central

  Article: 4-Hy-droxy-2-methyl-1,1-dioxo-N-phenyl-2H-1λ(6),2-benzothia-zine-3-carboxamide.

  Farhana Aman, Waseeq Ahmad Siddiqui, Adnan Ashraf, Hamid Latif Siddiqui, Masood Parvez
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  ABSTRACT: In the title mol-ecule, C(16)H(14)N(2)O(4)S, the thia-zine ring adopts a twist chair conformation with the N and adjacent C atom displaced by 0.966 (3) and 0.386 (4) Å, respectively, on the same side of the mean plane formed by the remaining ring atoms. The dihedral angle between the mean planes of the benzene rings is 37.65 (10)°. The mol-ecular structure features an intra-molecular O-H⋯O hydrogen bond, which generates an S(6) ring. In the crystal, mol-ecules are linked by N-H⋯O and C-H⋯O hydrogen bonds.
  Acta Crystallographica Section E Structure Reports Online 06/2012; 68(Pt 6):o1790. · 0.35 Impact Factor
• Source

  Available from: PubMed Central

  Article: 2,3-Dihydro-1λ(6),2-benzothia-zine-1,1,4-trione.

  Farhana Aman, Waseeq Ahmad Siddiqui, Adnan Ashraf, M Nawaz Tahir
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  ABSTRACT: In the title compound, C(8)H(7)NO(3)S, the benzene ring is oriented at a dihedral angle of 69.25 (7)° to the S and O atoms of the sulfonyl group. The heterocyclic ring approximates to an envelope, with the N atom in the flap position. In the crystal, mol-ecules are linked by N-H⋯O(c) (c = carbon-yl) hydrogen bonds, forming C(5) chains along [001]. Two R(2) (2)(10) loops arise from pairs of C-H⋯O hydrogen bonds and a weak aromatic π-π stacking inter-action [centroid-centorid separation = 3.8404 (11) Å] also occurs.
  Acta Crystallographica Section E Structure Reports Online 05/2012; 68(Pt 5):o1306. · 0.35 Impact Factor